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< Page ,Total 13 >
Effect of Microalloying Addition on Microstructure and Mechanical Properties of Ni-W Coatings EI SCIE
期刊论文 | 2021 , 50 (1) , 145-152 | Rare Metal Materials and Engineering
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Abstract :

The effect of processing technology and microalloying addition on the microstructure and mechanical properties of Ni-W coatings prepared by electrodeposition was studied. The surface morphology, microstructure, and tensile properties of Ni-W coatings were studied with a small W addition of less than 2.0at%. The results show that the Ni-W coatings have a single-phase fcc structure. By increasing the W content, the surface morphology of the coatings varies from the grooves between the coarse pyramid structures to uniformly distributed micropores. At the same time, the intensity of Ni(220) diffraction peak of the coatings is also gradually weakened, with the reduction of surface roughness and the grain size. There is a critical W addition of about 1.0at%, where the yield strength of Ni-W coating increases sharply from ~1.0 GPa at the W addition 1.0at%. However, the tensile elongation is insensitive to the W content, which keep almost unchanged within the studied W addition range. In addition, strain hardening capacity of the coatings is also stable with the W content. In this work, the mechanical properties of Ni-W coating with micro-addition of W are optimized through manipulation of microalloying effect on the surface defect and microstructure. © 2021, Science Press. All right reserved.

Keyword :

Microstructure Surface roughness Binary alloys Microalloying Morphology Coatings Mechanical properties Strain hardening Surface defects Surface morphology

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GB/T 7714 Cheng, Lu , Wang, Yaqiang , Zhang, Jinyu et al. Effect of Microalloying Addition on Microstructure and Mechanical Properties of Ni-W Coatings [J]. | Rare Metal Materials and Engineering , 2021 , 50 (1) : 145-152 .
MLA Cheng, Lu et al. "Effect of Microalloying Addition on Microstructure and Mechanical Properties of Ni-W Coatings" . | Rare Metal Materials and Engineering 50 . 1 (2021) : 145-152 .
APA Cheng, Lu , Wang, Yaqiang , Zhang, Jinyu , Liu, Gang , Sun, Jun . Effect of Microalloying Addition on Microstructure and Mechanical Properties of Ni-W Coatings . | Rare Metal Materials and Engineering , 2021 , 50 (1) , 145-152 .
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Plastic instability in Ti–6Cr–5Mo–5V–4Al metastable β-Ti alloy containing the β-spinodal decomposition structures EI SCIE
期刊论文 | 2021 , 811 | Materials Science and Engineering A
WoS CC Cited Count: 1
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Abstract :

Metastable β-titanium (Ti) alloys have been extensively used in aerospace industry owing to the outstanding mechanical properties. Temperature arising sometimes becomes unavoidable in service and thus it is necessary to evaluate plastic behavior of the alloys at elevated temperatures prior to applications. Here, plastic stability of metastable β-titanium alloys containing the β-spinodal decomposition structures at different temperatures is investigated for the first time using Ti–6Cr–5Mo–5V–4Al alloy as prototypical material. It is found that a serrated plastic flow with little frequency accompanied by overall strain softening appears in the tensile stress-strain curves at 298 K, while the serrated plastic flow occurs much more frequently and overall strain hardening capability is recovered appropriately when the tensile temperature is increased to 573 K. Microstructural characterizations reveal that ordinary dislocation slip dominates the alloy plasticity at all the testing temperatures. Dislocations strongly interact with the β-striations and dislocation debris are left around the striation interfaces. The resulting local stress accumulation destroys the β-striations in the form of shear bands so that sudden release of an avalanche of dislocations in the soft channels leads to stress drop. Subsequent dynamic reconstruction of the β-striations with the assistance of thermal activation especially at elevated temperature hardens the prior soft channels, which results in the following stress rise. The striking difference on deformation characteristics at 298 K and 573 K is that more homogeneous plasticity conferred by dense deformation bands at the latter, which is the direct reason on high serrated frequency and overall strain hardening. These findings offer valuable insights into plastic behavior of metastable β-Ti alloys, which will have important implications for the applications. © 2021 Elsevier B.V.

Keyword :

Aerospace industry Titanium alloys Spinodal decomposition Plasticity Strain hardening Tensile testing Shear flow Shear bands Plastic flow Stress-strain curves Strain rate

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GB/T 7714 Chen, Wei , Yu, Guoxiang , Li, Keer et al. Plastic instability in Ti–6Cr–5Mo–5V–4Al metastable β-Ti alloy containing the β-spinodal decomposition structures [J]. | Materials Science and Engineering A , 2021 , 811 .
MLA Chen, Wei et al. "Plastic instability in Ti–6Cr–5Mo–5V–4Al metastable β-Ti alloy containing the β-spinodal decomposition structures" . | Materials Science and Engineering A 811 (2021) .
APA Chen, Wei , Yu, Guoxiang , Li, Keer , Wang, Yue , Zhang, Jinyu , Sun, Jun . Plastic instability in Ti–6Cr–5Mo–5V–4Al metastable β-Ti alloy containing the β-spinodal decomposition structures . | Materials Science and Engineering A , 2021 , 811 .
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New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization EI SCIE
期刊论文 | 2021 , 205 | MATERIALS & DESIGN
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omega-embrittlement is ubiquitous in metastable beta-titanium (Ti) alloys, while the fundamental understanding on the damage-fracture mechanism hitherto remains elusive. In this study, we systematically investigate omega-embrittlement of high misfit Ti-10Cr (wt.%) alloys by coupling experiments and first-principles calculation. It is found that brittle cleavage-like fracture prevails in tensile samples, irrespective of the quenching or subsequent aging states. Microscopically, cracks nucleation and propagation proceed along slip bands, inside which omega-lattices are first disordered and then the localized (beta + omega)-amorphous-like structures are developed in the shape of white patches. The underlying mechanism of mechanically-driven localized amorphization is that due to the remarkable covalent character of atomic bonding of x-precipitates caused by composition partitioning of the Cr element, omega-precipitates impart extremely high energy barrier opposed to dislocation gliding and render dislocations pile-up ahead of omega-precipitates, thus leading to their lattice disordering. It is unveiled that the hydrostatic pressure, serving as the driving force for dislocations pile-up, plays a critical role in this unusual cleavage-like fracture of Ti-10Cr alloys caused by mechanically-driven omega-mediated localized amorphization. Accompanied by the transition from the co-operation of deformation twining and ordinary dislocation slip in the quenched Ti10Cr alloys to the exclusive ordinary dislocation slip in the long-time aged Ti-10Cr samples, it is unexpected that the resulting tensile fracture strength monotonically decreases to a stress level of similar to 100 MPa. These findings provide new insights into the damage and fracture behavior of high misfit beta-titanium alloys, such as Ti-Cr alloys. (C) 2021 The Authors. Published by Elsevier Ltd.

Keyword :

Amorphization Titanium alloys omega-precipitates Slip band Brittleness

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GB/T 7714 Chen, Wei , Cao, Shuo , Zhang, Jinyu et al. New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization [J]. | MATERIALS & DESIGN , 2021 , 205 .
MLA Chen, Wei et al. "New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization" . | MATERIALS & DESIGN 205 (2021) .
APA Chen, Wei , Cao, Shuo , Zhang, Jinyu , Zha, You , Hu, Qingmiao , Sun, Jun . New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization . | MATERIALS & DESIGN , 2021 , 205 .
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Achieving high strength-ductility synergy in a hierarchical structured metastable beta-titanium alloy using through-transus forging EI SCIE
期刊论文 | 2021 , 11 , 1622-1636 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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High-strength titanium (Ti) alloys are progressively demanded for structural applications in weight-critical aerospace industry. Improving mechanical properties of the alloys are thus exploited in response to the requirement. In this study, a strategy of through-transus thermomechanical forging was applied to the Ti-10 V-2Fe-3Al metastable beta-Ti alloy, and the resulting microstructures and mechanical properties were systematically investigated in comparison to the conventional (alpha+beta) dual-phase field forging. It is found that the through-transus thermomechanical forging significantly enhances strength, ductility and strain hardening capacity, while it is the inferior combinations of mechanical properties in the alloys subjected to the (alpha+beta) dual-phase field forging. Microstructural characterization reveals that the former renders the hierarchical microstructure composed of intergranular alpha(p)-necklaces, and intragranular alpha(p)-rods as well as as-lamellae in the b-matrix. The superior combinations of mechanical properties are conferred by good strain compatibility of these microstructural constituents. By contrast, the latter renders the network microstructure comprised of intergranular globular alpha(p)-phase and continuous grain boundary (GB) alpha(GB)- films as well as the intragranular alpha(s)-lamellae. Local deformation-damage is more preferred to initiate in the intergranular network structure. These findings provide fundamental understanding on the correlation between mechanical properties and microstructures, facilitating manufacturing high-performance beta-Ti alloys at an industry scale using commercially available thermomechanical processing. (C) 2021 The Authors. Published by Elsevier B.V.

Keyword :

Metastable beta-Ti alloys Mechanical properties Hierarchical microstructure Dislocations Thermomechanical processing

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GB/T 7714 Bao, Xiangyun , Chen, Wei , Zhang, Jinyu et al. Achieving high strength-ductility synergy in a hierarchical structured metastable beta-titanium alloy using through-transus forging [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2021 , 11 : 1622-1636 .
MLA Bao, Xiangyun et al. "Achieving high strength-ductility synergy in a hierarchical structured metastable beta-titanium alloy using through-transus forging" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 11 (2021) : 1622-1636 .
APA Bao, Xiangyun , Chen, Wei , Zhang, Jinyu , Yue, Yonghai , Sun, Jun . Achieving high strength-ductility synergy in a hierarchical structured metastable beta-titanium alloy using through-transus forging . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2021 , 11 , 1622-1636 .
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A novel deformation mechanism in Ti-V binary metastable beta-Ti alloys: Deformation kinking promoted by dislocation accumulation EI SCIE
期刊论文 | 2021 , 875 | JOURNAL OF ALLOYS AND COMPOUNDS
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Unlike stress-induced martensitic transformation, deformation twinning as well as dislocation gliding, deformation kinking is an uncommon deformation mechanism in metastable beta-titanium (Ti) alloys. In this study, the unique deformation mechanism was reported in Ti-V binary beta-Ti alloys for the first time. It was found that a large number of kink bands were distributed in beta-grains after cold forging at a strain rate of similar to 10(3) s(-1). Microstructural characterization manifests that the appearance of kink bands is frequently accompanied by slip bands, whilst dense dislocations are accumulated around the kink bands on a microscopic scale. Such local plastic deformation is quite strong so that the pre-existing athermal omega-precipitates in the initial microstructure is completely destroyed within the kink bands and instead fresh deformation-induced single variant of omega-precipitates is produced. This deformation localization mainly originates from the impediment of dislocation activity caused by both pre-existing athermal omega-precipitates and the intrinsic slip retardation in BCC crystal structures. The deformation kinking is thus suggested to follow a dislocation-based formation mechanism, whilst the resulting Taylor axis of lattice rotation was deduced to be <011>(beta) on basis of extensive crystallographic analysis. These findings enrich fundamental understanding on deformation kinking, and provide helpful information for utilizing the unique deformation mechanism to tune mechanical properties of beta-Ti alloys. (C) 2021 Elsevier B.V. All rights reserved.

Keyword :

Deformation kinking Strain rate Metastable beta-titanium alloys omega-precipitates Dislocations

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GB/T 7714 Li, Keer , Chen, Wei , Yu, Guoxiang et al. A novel deformation mechanism in Ti-V binary metastable beta-Ti alloys: Deformation kinking promoted by dislocation accumulation [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 875 .
MLA Li, Keer et al. "A novel deformation mechanism in Ti-V binary metastable beta-Ti alloys: Deformation kinking promoted by dislocation accumulation" . | JOURNAL OF ALLOYS AND COMPOUNDS 875 (2021) .
APA Li, Keer , Chen, Wei , Yu, Guoxiang , Zhang, Jinyu , Sun, Jun . A novel deformation mechanism in Ti-V binary metastable beta-Ti alloys: Deformation kinking promoted by dislocation accumulation . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 875 .
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Research progress in preparation, microstructure and properties of thin high-entropy alloy films EI
期刊论文 | 2021 , 50 (2) , 74-90 | Surface Technology
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Compared with traditional alloy films, the thin high-entropy alloy (HEA) films exhibit more excellent mechanical properties and unique physicochemical properties, which have made great progress in the past 14 years. In order to review the recent research progress of thin HEA films, this paper first introduces the preparation technology (sputtering deposition, plasma spraying, laser cladding, plasma-transferred arc-cladding, electrochemical deposition and cathodic-arc-vapor deposition) of thin HEA films, elaborates the classification and characteristics of the most widely used sputtering deposition technology, as well as the advantages & disadvantages and application scope of each technology, and then summarizes the microstructures and properties (mechanical properties, corrosion resistance, wear resistance, irradiation resistance and high-temperature oxidation resistance) of thin HEA films. HEA is a kind of multiple principal-element solid solutions, which breaks the conventional design criteria of alloy materials to obtain particular properties via adding other alloying elements. Therefore, for thin HEA films, the microstructure is denser, the phase structure is more stable, and the system is more complex, which make it exhibit many outstanding performances. Finally, this paper discusses the existing problems and shortcomings in the current research, among which the main problem is that the research on the relationship between structure and performance is not thorough enough, the internal mechanism is not yet clear, so the research should focus on this in the future. © 2021, Chongqing Wujiu Periodicals Press. All rights reserved.

Keyword :

Wear resistance Physicochemical properties Vapor deposition Hard facing Thermooxidation Alloying elements High temperature corrosion Film preparation Oxidation resistance Metallic films High-entropy alloys Laser applications Microstructure Plasma welding Reduction Electrochemical deposition Plasma spraying Entropy

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GB/T 7714 An, Bang , Wang, Ya-Qiang , Zhang, Jin-Yu et al. Research progress in preparation, microstructure and properties of thin high-entropy alloy films [J]. | Surface Technology , 2021 , 50 (2) : 74-90 .
MLA An, Bang et al. "Research progress in preparation, microstructure and properties of thin high-entropy alloy films" . | Surface Technology 50 . 2 (2021) : 74-90 .
APA An, Bang , Wang, Ya-Qiang , Zhang, Jin-Yu , Liu, Gang , Sun, Jun . Research progress in preparation, microstructure and properties of thin high-entropy alloy films . | Surface Technology , 2021 , 50 (2) , 74-90 .
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Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable β Titanium Alloy EI
期刊论文 | 2021 , 50 (2) , 717-724 | Rare Metal Materials and Engineering
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This article introduced the current research progress and theoretical basis of designing the twin induced plasticity (TWIP)/transformation induced plasticity (TRIP) metastable β titanium alloys, and summarized β-grain sizes, yield strength and work hardening capability of the double twined {332} and {112} metastable β titanium alloys. The application and limitation of combination times (Bo)-d electron orbit energy level (Md) diagram in the design of multi-component titanium alloys were further discussed, especially the effect of different secondary phases (α-phase and ω-phase) on the stability of the matrix β-phase. The factors that influence the deformation mechanisms of TWIP/TRIP metastable β titanium alloys are emphasized in terms of the matrix β phase stability, precipitated phases, β-grain sizes and crystallographic orientations. And the current deficiencies of this field were analyzed. Furthermore, the effect of double twinning mechanisms on the mechanical properties of titanium alloys was briefly discussed as well. Finally, by summarizing the research progress and related issues, this article conveyed the new insights for the development of high-strength and tough titanium alloys. © 2021, Science Press. All right reserved.

Keyword :

Deformation Grain size and shape Titanium alloys Metastable phases Plasticity Strain hardening High strength alloys

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GB/T 7714 Zhang, Chongle , Bao, Xiangyun , Zhang, Jinyu et al. Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable β Titanium Alloy [J]. | Rare Metal Materials and Engineering , 2021 , 50 (2) : 717-724 .
MLA Zhang, Chongle et al. "Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable β Titanium Alloy" . | Rare Metal Materials and Engineering 50 . 2 (2021) : 717-724 .
APA Zhang, Chongle , Bao, Xiangyun , Zhang, Jinyu , Liu, Gang , Sun, Jun . Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable β Titanium Alloy . | Rare Metal Materials and Engineering , 2021 , 50 (2) , 717-724 .
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Achieving excellent strength-ductility synergy in twinned NiCoCr medium-entropy alloy via Al/Ta co-doping EI SCIE
期刊论文 | 2021 , 87 , 184-195 | Journal of Materials Science and Technology
WoS CC Cited Count: 1
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Alloying is an effective strategy to tailor microstructure and mechanical properties of metallic materials to overcome the strength-ductility trade-off dilemma. In this work, we combined a novel alloy design principle, i.e. harvesting pronounced solid solution hardening (SSH) based on the misfit volumes engineering, and simultaneously, architecting the ductile matrix based on the valence electron concentrations (VEC) criterion, to fulfill an excellent strength-ductility synergy for the newly emerging high/medium-entropy alloys (HEAs/MEAs). Based on this strategy, Al/Ta co-doping within NiCoCr MEA leads to an efficient synthetic approach, that is minor Al/Ta co-doping not only renders significantly enhanced strength with notable SSH effect and ultrahigh strain-hardening capability, but also sharply refines grains and induces abnormal twinning behaviors of (NiCoCr)92Al6Ta2 MEA. Compared with the partially twinned NiCoCr MEA, the yield strength (σy) and ultimate tensile strength (σUTS) of fully twinned Al/Ta-containing MEA were increased by ∼102 % to ∼600 MPa and ∼35 % to ∼1000 MPa, respectively, along with good ductility beyond 50 %. Different from the NiCoCr MEA with deformation twins (DTs)/stacking faults (SFs) dominated plasticity, the extraordinary strain-hardening capability of the solute-hardened (NiCoCr)92Al6Ta2 MEA, deactivated deformation twinning, originates from the high density of dislocation walls, micro-bands and abundance of SFs. The abnormal twinning behaviors, i.e., prevalence of annealing twins (ATs) but absence of DTs in (NiCoCr)92Al6Ta2 MEA, are explained in terms of the relaxation of grain boundaries (for ATs) and the twinning mechanism transition (for DTs), respectively. © 2021

Keyword :

Plasticity Ternary alloys Twinning Chromium alloys Deformation Cobalt alloys Economic and social effects Grain boundaries Aluminum alloys Tantalum alloys Ductility Tensile strength Strain hardening

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GB/T 7714 Zhang, D.D , Wang, H , Zhang, J.Y et al. Achieving excellent strength-ductility synergy in twinned NiCoCr medium-entropy alloy via Al/Ta co-doping [J]. | Journal of Materials Science and Technology , 2021 , 87 : 184-195 .
MLA Zhang, D.D et al. "Achieving excellent strength-ductility synergy in twinned NiCoCr medium-entropy alloy via Al/Ta co-doping" . | Journal of Materials Science and Technology 87 (2021) : 184-195 .
APA Zhang, D.D , Wang, H , Zhang, J.Y , Xue, H , Liu, G , Sun, J . Achieving excellent strength-ductility synergy in twinned NiCoCr medium-entropy alloy via Al/Ta co-doping . | Journal of Materials Science and Technology , 2021 , 87 , 184-195 .
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Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable beta Titanium Alloy SCIE
期刊论文 | 2021 , 50 (2) , 717-724 | RARE METAL MATERIALS AND ENGINEERING
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Abstract :

This article introduced the current research progress and theoretical basis of designing the twin induced plasticity (TWIP)/transformation induced plasticity (TRIP) metastable beta titanium alloys, and summarized beta-grain sizes, yield strength and work hardening capability of the double twined {332}<113> and {112}<111> metastable beta titanium alloys. The application and limitation of combination times (Bo)-d electron orbit energy level (Md) diagram in the design of multi-component titanium alloys were further discussed, especially the effect of different secondary phases (alpha-phase and omega-phase) on the stability of the matrix beta-phase. The factors that influence the deformation mechanisms of TWIP/TRIP metastable beta titanium alloys are emphasized in terms of the matrix beta phase stability, precipitated phases, beta-grain sizes and crystallographic orientations. And the current deficiencies of this field were analyzed. Furthermore, the effect of double twinning mechanisms on the mechanical properties of titanium alloys was briefly discussed as well. Finally, by summarizing the research progress and related issues, this article conveyed the new insights for the development of high-strength and tough titanium alloys.

Keyword :

phase stability metastable beta titanium alloy deformation mechanism double-twins TWIP/TRIP

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GB/T 7714 Zhang Chongle , Bao Xiangyun , Zhang Jinyu et al. Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable beta Titanium Alloy [J]. | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (2) : 717-724 .
MLA Zhang Chongle et al. "Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable beta Titanium Alloy" . | RARE METAL MATERIALS AND ENGINEERING 50 . 2 (2021) : 717-724 .
APA Zhang Chongle , Bao Xiangyun , Zhang Jinyu , Liu Gang , Sun Jun . Research Progress on Composition Design, Deformation Mechanism and Mechanical Properties of Metastable beta Titanium Alloy . | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (2) , 717-724 .
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Alloying effects on the microstructure and mechanical properties of nanocrystalline Ti-based alloyed thin films EI SCIE PubMed
期刊论文 | 2021 , 13 (39) , 16649-16661 | NANOSCALE
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Ti-based films alloyed with various Ta or Zr contents were deposited on a Si (100) substrate by magnetron sputtering. Transmission electron microscopy observations suggested that the solute Ta and Zr atoms distributed uniformly in the matrix Ti, refining the grain size. The microstructure transformed from single phase alpha-Ti to the coexistence of (alpha + beta)-Ti when the Ta addition was increased to 18.2 at%. Hardness and strain rate sensitivity of the Ti-based alloyed films were evaluated by nanoindentation experiments, to show the effects of constituents and their contents. The hardness was found to change non-monotonously within the studied Ta or Zr range, which could be explained by alloying dependence of the strengthening mechanisms, including partial dislocation mechanism emanating from grain boundaries, solid solution strengthening, and solution pinning strengthening. Furthermore, a mechanistic model based on partial dislocation inhomogeneous nucleation was employed to describe the composition-dependent strain rate sensitivity of the alloyed Ti films.

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GB/T 7714 Hou, Zhaoqi , Zhang, Jinyu , Zhang, Peng et al. Alloying effects on the microstructure and mechanical properties of nanocrystalline Ti-based alloyed thin films [J]. | NANOSCALE , 2021 , 13 (39) : 16649-16661 .
MLA Hou, Zhaoqi et al. "Alloying effects on the microstructure and mechanical properties of nanocrystalline Ti-based alloyed thin films" . | NANOSCALE 13 . 39 (2021) : 16649-16661 .
APA Hou, Zhaoqi , Zhang, Jinyu , Zhang, Peng , Wu, Kai , Wang, Yaqiang , Liu, Gang et al. Alloying effects on the microstructure and mechanical properties of nanocrystalline Ti-based alloyed thin films . | NANOSCALE , 2021 , 13 (39) , 16649-16661 .
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